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What Do AC Error Codes Mean?
Posted On: June 2, 2024
Air conditioning (AC) units can display error codes when something goes wrong. These codes are specific to the manufacturer and model of the AC unit, but here are some general explanations for common AC error codes:
General AC Error Codes
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E1/E2/E3/E4: These codes often indicate issues with sensors:
- E1: Room temperature sensor error.
- E2: Indoor coil sensor error.
- E3: Indoor fan speed malfunction.
- E4: Outdoor coil sensor error.
-
F1/F2/F3: These codes are usually related to the frequency drive or the main control board.
- F1: Indoor unit PCB (Printed Circuit Board) error.
- F2: Outdoor unit PCB error.
- F3: Outdoor ambient temperature sensor error.
-
H1/H2/H3: These codes generally indicate protection errors.
- H1: Defrosting mode.
- H2: Overload protection of the compressor.
- H3: High-temperature protection of the compressor.
-
P1/P2/P3: These codes typically relate to pressure or system malfunctions.
- P1: High pressure protection of the system.
- P2: Low pressure protection of the system.
- P3: Protection against lack of refrigerant or malfunction in the refrigerant system.
-
L1/L2/L3: These codes can be related to electrical issues.
- L1: Phase loss or imbalance.
- L2: Overcurrent protection.
- L3: Voltage error or under-voltage protection.
Manufacturer-Specific Error Codes
LG
- CH 01: Indoor unit room temperature sensor error.
- CH 02: Indoor unit pipe temperature sensor error.
- CH 03: Communication error between indoor and outdoor units.
Daikin
- U0: Low refrigerant.
- U4: Transmission error.
- E1: Circuit board malfunction.
Mitsubishi
- P1: Abnormal rise in pressure.
- P8: Outdoor unit air temperature sensor error.
- E0: Inverter/compressor malfunction.
Samsung
- E101: Communication error.
- E121: Indoor temperature sensor error.
- E154: Outdoor coil sensor error.
What to Do When an Error Code Appears
- Consult the Manual: The best source of information is the user manual or service manual for your specific AC model.
- Reset the Unit: Sometimes, resetting the unit by turning it off and on again can clear the error.
- Check for Obvious Issues: Ensure that filters are clean, vents are not blocked, and that there is no visible damage to the unit.
- Call a Professional: If the error persists, it's best to contact a professional technician. They can diagnose and fix the issue safely.
Understanding these codes can help you determine whether the issue is something simple that you can fix yourself or if you need to call a professional for assistance.
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See What Our Customers Are Saying:
Feb 18, 2025
Very pleased with the professional service that TwinTech Heating and Cooling provided in replacing my furnace. I got several quotes from different service providers. Their price was excellent and they explained the features very well. We are very glad we went with TwinTech and highly recommend their services.
Feb 18, 2025
We were new homeowners in need of a second opinion. TwinTech Heating & Cooling were Amazing and professional. Very knowledgeable and great service all around. Recommend to anyone looking for honest and reliable services. Treated with respect and care. Thank you Greg, Mitch and Bob!
Feb 18, 2025
TwinTech is an excellent and honest company! I called them for a second opinion after being told by another company that I needed to replace my furnace. Turns out this was not the case at all! I did not need a new furnace. TwinTech did not push to make an unnecessary sale and saved me from a huge expense. Bob and Mitch were extremely professional and above all honest! I definitely recommend TwinTech!
Feb 18, 2025
Amazing experience with TwinTech Heating & Cooling! Their team was professional, knowledgeable, and efficient from start to finish. They installed my new furnace quickly and left everything spotless. The technicians took the time to explain everything and made sure I was comfortable with the system before they left. Great customer service and fair pricing. I highly recommend them for anyone needing HVAC services!
Feb 18, 2025
Great experience all around. Bob was sharp and easy to talk to, and Greg handled the installation perfectly. Would hire them again in a heartbeat.
Aug 17, 2024
I returned from vacation to find my AC unit on the Fritz. After calling way too many places I connected with TwinTech. Ive used the company in the past for my furnace so I was happy when I recognized Greg at my front door. Hes great and the service is always top notch. Id highly recommend using twintech for honest, superior service in the Durham region. Thanks!
Aug 13, 2024
I called Twin Tech when my air conditioning stopped working. Greg came over to diagnose the issue - the same day. He was able to diagnose the issue and resolve it quite quickly. Although it was a quick fix, Greg was very thorough in explaining the issue and provided great advice. Not to mention, I felt very comfortable having Greg in my home - which I consider very important when hiring a service provider. Twin Tech will be my go-to from now on. Thank you!!
Aug 12, 2024
Just hired TwinTech Heating & Cooling to do an A/C Unit removal & reinstall to allow for landscaping access on the side of my house, and they were wonderful!
Bob, Greg & Mitch make a great team! Quick appointment times, super knowledgeable, expert troubleshooting capabilities & very customer service oriented.
I would highly recommend them for all of your HVAC needs! Great job guys!!
Jul 23, 2024
Twintech Heating & Cooling installed my furnace in 2022 and in fall of 2023 installed my Panasonic Heat Pump. Greg and Mitch did a great job. Helped me through the rebate process. Super happy with the Heat Pump. Only used my furnace 5 times this winter. Energy bills lower, carbon emissions lower.Thank you Twintech. I recommend highly!
Jul 18, 2024
Just had a new furnace installed by Twintech. I cant express how great these guys are at what they do. From the sales to installation they were professional all the way. Very reasonable pricing and courteous during the installation and willing to answer any questions I had. Highly recommended !!!
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